Bostitch 4-1/2" x 1/4" Masonry (Blk), BSA4501CM: * 4-1/2" x 1/4" * 3 full sheets of fiber glass for added durability and safety * Softer formulation for faster grinding in harder materials * Diameter: 4-1/2" * Edge Thickness: 1/4" * Arbor: 7/8" * Metal grinding * Max RPM:13,300